Goodwill, Service Contracts and Other Assets - Information Regarding Service Contracts and Other Assets (Details) - USD ($) $ in Thousands	Nov. 30, 2019	May 31, 2019
Information regarding service contracts and other assets
Service contracts, net	$ 469,933	$ 494,595
Other assets, carrying amount	431,627	369,630
Other assets, accumulated amortization	171,001	129,315
Other assets, net	260,626	240,315
Capitalized contract costs
Information regarding service contracts and other assets
Other assets, carrying amount	325,160	277,016
Other assets, accumulated amortization	109,055	71,062
Other assets, net	216,105	205,954
Other assets current	74,900	69,600
Noncompete and consulting agreements
Information regarding service contracts and other assets
Other assets, carrying amount	42,687	42,308
Other assets, accumulated amortization	40,937	40,524
Other assets, net	1,750	1,784
Other
Information regarding service contracts and other assets
Other assets, carrying amount	63,780	50,306
Other assets, accumulated amortization	21,009	17,729
Other assets, net	42,771	32,577
Service Contracts
Information regarding service contracts and other assets
Service contracts, carrying amount	932,833	928,635
Service contracts, accumulated amortization	462,900	434,040
Service contracts, net	$ 469,933	$ 494,595